For iPhones and iPads – Simply hold your device near the contactless reader and keep your finger on Touch ID or enter your passcode. For Apple watch – double click the side button to activate Apple Pay and hold your watch near the reader. A sound, screen check mark and vibration will let you know that the payment was successful.
For Android: Android devices that support Google Pay are those which are Near Field Communication (NFC)-enabled and running KitKat 4.4 and above.
On enabled devices, you can also use Apple Pay to pay with a single touch in-apps. Checking out is as easy as selecting “Apple Pay” and placing your finger on the Touch ID.